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Most Important Selected Qs for JEE AdvancedPhysicsWave Optics

Paragraph: Refracting angles of biprism are both 0.15^ . Distance of biprism from source is 30 cm . Distance between source and screen is 140 cm . The Fresnel's biprism arrangement shown in the figure uses a source of light of wavelength 6000 Å . When a converging lens is moved between the biprism and the screen two images of S are focused on the screen for two positions of the lens. The separations between the two i

Options

  1. A120 7 ~cm
  2. B240 7 ~cm
  3. CData not sufficient
  4. DNone

Correct answer

B. 240 7 ~cm

Step-by-step solution

aligned & h ₀= h ₁ ~h ₂ = 1.6 0.9 =1.2 ~mm ; h =1.6 ; h ₀=1.2 & ~m ₁= 4 3 = 140- x ₁ x ₁ x ₁=80 1 60 - 1 -80 = 1 f f = 240 7 ~cm and x ₂=60 aligned

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